trace_collections.cpp:9:1: warning: [blink-gc] Class 'HeapObject' has untraced fields that require tracing.
void HeapObject::Trace(Visitor* visitor) const {}
^
./trace_collections.h:17:5: note: [blink-gc] Untraced field 'm_heapVector' declared here:
    HeapVector<Member<HeapObject> > m_heapVector;
    ^
./trace_collections.h:18:5: note: [blink-gc] Untraced field 'm_wtfVector' declared here:
    Vector<Member<HeapObject>, 0, HeapAllocator> m_wtfVector;
    ^
./trace_collections.h:20:5: note: [blink-gc] Untraced field 'm_heapDeque' declared here:
    HeapDeque<Member<HeapObject> > m_heapDeque;
    ^
./trace_collections.h:21:5: note: [blink-gc] Untraced field 'm_wtfDeque' declared here:
    Deque<Member<HeapObject>, 0, HeapAllocator> m_wtfDeque;
    ^
./trace_collections.h:23:5: note: [blink-gc] Untraced field 'm_heapSet' declared here:
    HeapHashSet<Member<HeapObject> > m_heapSet;
    ^
./trace_collections.h:24:5: note: [blink-gc] Untraced field 'm_wtfSet' declared here:
    HashSet<Member<HeapObject>, void, HeapAllocator> m_wtfSet;
    ^
./trace_collections.h:26:5: note: [blink-gc] Untraced field 'm_heapLinkedSet' declared here:
    HeapLinkedHashSet<Member<HeapObject> > m_heapLinkedSet;
    ^
./trace_collections.h:27:5: note: [blink-gc] Untraced field 'm_wtfLinkedSet' declared here:
    LinkedHashSet<Member<HeapObject>, void, HeapAllocator> m_wtfLinkedSet;
    ^
./trace_collections.h:29:5: note: [blink-gc] Untraced field 'm_heapCountedSet' declared here:
    HeapHashCountedSet<Member<HeapObject> > m_heapCountedSet;
    ^
./trace_collections.h:30:5: note: [blink-gc] Untraced field 'm_wtfCountedSet' declared here:
    HashCountedSet<Member<HeapObject>, void, HeapAllocator> m_wtfCountedSet;
    ^
./trace_collections.h:32:5: note: [blink-gc] Untraced field 'm_heapMapKey' declared here:
    HeapHashMap<int, Member<HeapObject> > m_heapMapKey;
    ^
./trace_collections.h:33:5: note: [blink-gc] Untraced field 'm_heapMapVal' declared here:
    HeapHashMap<Member<HeapObject>, int > m_heapMapVal;
    ^
./trace_collections.h:34:5: note: [blink-gc] Untraced field 'm_wtfMapKey' declared here:
    HashMap<int, Member<HeapObject>, void, void, HeapAllocator> m_wtfMapKey;
    ^
./trace_collections.h:35:5: note: [blink-gc] Untraced field 'm_wtfMapVal' declared here:
    HashMap<Member<HeapObject>, int, void, void, HeapAllocator> m_wtfMapVal;
    ^
1 warning generated.